radiosonde_auto_rx/rs41

Radiosonde RS41

Files

• rs41ecc.c, RS/ecc/bch_ecc.c

Compile

(copy bch_ecc.c)
gcc rs41ecc.c -lm -o rs41ecc

Usage

./rs41ecc [options] <audio.wav>

• <audio.wav>: FM-demodulated signal, recorded as wav audio file
• options:
  -i: invert signal/polarity
  -b: alternative demod
  -r: output raw data
  -v, -vx, -vv: additional data/aux/info
  --ecc: Reed-Solomon error correction
  --crc: CRC blocks: 0-OK, 1-NO
  --sat: additional Sat data
  

./rs41gps -h: list more options

Examples

FSK-demodulation is kept very simple. If the signal quality is low and (default) zero-crossing-demod is used, a lowpass filter is recommended:

• sox 20170116_12Z.wav -t wav - lowpass 2800 2>/dev/null | ./rs41ecc --ecc --crc -vx

If timing/sync is not an issue, integrating the bit-samples (option -b) is better for error correction:

• ./rs41ecc -b --ecc --crc -vx 20170116_12Z.wav

If the signal is inverted (depends on sdr-software and/or audio-card/settings), try option -i.

(cf. /RS/rs92)